High pressure slid down the western Dakotas, keeping wind speeds in the 5 to 10 mph range over eastern North Dakota and portions of the northwest quarter of Minnesota through the late evening and overnight hours. Combined with temperatures in the teens to lower 20s below zero, wind chill values plummeted to values of 40 below zero or lower. The lowest wind chill readings were 49 below in eastern Eddy County and 47 below at Langdon.